JPS595928Y2 - sliding variable resistor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sliding variable resistor, and is intended to provide a sliding type variable resistor that is suitable for application to a device equipped with a shield structure to prevent invasion of foreign objects from the outside.

A conventional sliding variable resistor generally has a structure as shown in FIG. 1, for example, with a top plate 1a and a side plate 1
b. There is an opening below the end plate lc' of the metal case 1. Parts such as a slider are inserted into the case 1 through this opening, and a resistor 5 and a conductor 6 are inserted. Although the structure is such that the provided insulating substrate 4 is fixed to the opening of the case 1, it is not preferable to use the metal case 1 from an electrical safety standpoint, and foreign matter may enter through the long lever groove 1d. However, there are drawbacks such as deterioration of safety and performance.

In view of the above drawbacks, the present invention aims to improve safety and performance, as well as improve assembly and productivity.
To explain one embodiment in detail with reference to the drawings, in the exploded perspective view of the sliding variable resistor shown in FIG.
1 is a rectangular parallelepiped-shaped molded case in which upper and lower plates 1a, 1e and side plates 1b, lb are integrally molded by a base 1C provided at one end, and the other end is an opening 1f; The upper surface plate 1a of the case 1 is provided with a pair of opposing protrusions 1g, Ig extending in the longitudinal direction, and the protrusions 1g,
A long guide groove 1d for guiding the lever is formed between 1g and a similar long groove 1h is formed on the bottom plate 1e.

11... are opposed protrusions having inclined surfaces 1j provided on the upper and lower plates 1a, la on the opening 1f side of the case 1;
1k, 1k are notches wider than the long grooves 1d, lh provided in the upper and lower plates 1a, 1a, and the notches l
Four engaging legs 1l with tapered tips are formed on the upper and lower plates 1a and 1e by k and lk.

Note that 1 m is a mounting hole for mounting the variable resistor itself provided on the base 1e.

Furthermore, a pair of opposing protrusions 1n, 1n along the longitudinal direction of the case 1 are formed on the inner walls of the side plates lb, lb.

Next, 2 is a sliding body having a slider 7, and the sliding body 2
is the upper and lower two-tier support stand 2 held between the opposing legs 2a, 2a.
A lever 2d is provided protruding from the upper supporting frame 2b from b and 2C, and a leaf spring 8 and an insulated movable element 9 are attached to the lever 2d.
is inserted and installed on the support stand 2b.

Further, the lower support frame 2C serves as a slider holder, and the slider 7 is fixed to the lower surface of the support frame 2C.
There is a cavity 2e between them.

Reference numeral 3 denotes an insulating cap for closing the opening 1f of the case 1. At the four corners of one side surface 3a of the cap 3, there are four opposing folds whose tips are bent to open outward. A curved engagement arm 3b... is formed, and in the center of the side surface 3a there is a mounting leg 3d with a bifurcated tip.
, 3d is protruded from the elongated shield plate 3C,
The shield plate 3C is for penetrating the cavity 2e of the sliding body 2, and its dimensions are slightly smaller than the cavity 2e. It is larger than the width of 1d.

3e, 3e are a pair of protrusions provided protrudingly between the shield plate 3C of the side surface 3a and one of the retaining arms 3b; 3f...
... is the other opposing side surface 3g, 3g of the cap 3
When the cap 3 is inserted into the opening 1f of the case 1, the engagement legs of the upper and lower plates 1a and 1e of the case 1 are inserted into the notch groove 3f. 11...
...is a structure in which they fit together.

Note that 3h is an L-shaped flange for completely sealing the openings 1f provided on the side surfaces 3g, 3g, and 31 is a mounting hole facing the mounting hole 1m of the base 1C of the case 1.

Reference numeral 4 denotes an insulating substrate, on which a resistor 5 on which the slider 7 fixed to the slider 2 slides, and a conductor 6 made of silver paste or the like are respectively formed by printing or the like. Terminals 10 and 11 are connected to the ends of the resistor 5, and intermediate terminals 12 are connected to the middle of the conductor 6.

Further, an engaging portion 4a such as a trapezoidal notch is provided at one end of the insulating substrate 4, and the pair of protrusions 3e, 3e of the cap 3 are fitted into the retaining portion 4a.

Therefore, to explain how to assemble the sliding variable resistor having the above structure, first insert the sliding body 2, which has the leaf spring 8 and the insulated mover 9 through the lever 2d through the opening 1f of the case 1, into the top plate of the case 1. 1a and the protrusions 1n, 1n, and the insulated mover 9 inserted into the lever 2d of the sliding body 2.
are attached to the inner wall of the upper surface plate 1a, the opposing legs 2a of the sliding body 2,
The end surfaces of 2a are in contact with the protrusions 1n, 1n, respectively, and the lever 2d is in contact with the long guide groove 1d of the top plate 1a of the case 1.
The sliding body 2 is allowed to slide inside the case 1 along these lines.

Next, the resistor 5 and The conductor 6 is brought into contact with the slider 7 fixed to the slider 2.

The terminals 10, 11, and 12 provided on the substrate 4 are led out from the long groove 1h of the bottom plate 1e (7) of the case 1.

Finally, insert the shield plate 3C of the insulating cap 3 into the cavity 2e of the sliding body 2 previously inserted into the case 1,
In addition, mounting feet 3d, 3d are attached to the tip of the shield plate 3C.
is fitted into the cut groove) 1p (see FIG. 5) provided in the base body 1C in the case 1, while the bent engagement arm 3b of the cap 3
As shown in FIG. 3, the projections 11 of the case 1...
... rides on the slope 1j of .

Therefore, the bent portion 3b' of the retaining arm 3b engages with the protrusion 11, thereby preventing the cap 3 from coming off in the direction of the arrow.

At this time, the shield plate 3C penetrates the cavity 2e of the sliding body 2 and is supported between the base body 1C in the case 1 and the cap 3 while blocking the guide groove 1d of the lever 2d on the top plate 1a of the case 1. Therefore, the opening 1 of the case 1
f is completely sealed by the L-shaped flange 3h provided on the side surfaces 3g, 3g of the cap 3.

On the other hand, at the same time, as shown in FIG. 4, the pair of protrusions 3e, 3e of the cap 3 are fitted into the retaining portion 4a of the insulating substrate 4, which has a trapezoidal notch at its tip, and are pressed into contact with each other. Part 4a
By forcibly bending the projecting body 3e3e inwardly by the slope 4b, the insulating substrate 4 is
is securely fixed within the case 1, and can be prevented from wobbling in the vertical and horizontal directions.

FIGS. 5 and 6 are a vertical cross-sectional view and a cross-sectional view of the sliding variable resistor of the present invention that has been assembled in this way, and the sliding body 2 and the insulating substrate 4 are connected to the side plates 1b and lb of the case 1. It is housed above and below the protrusions 1n and 1n provided on the inner wall, and a lever 2d integrated with the sliding body 2 protrudes from the long groove 1d of the top plate 1a of the case 1 to the outside of the case 1. Terminals 10, 11 . 12 is led out of the case 1, and a desired resistance value can be taken out from the terminal by operating the lever 2d.

Further, the long groove 1d of the upper surface plate 1a is formed in the cavity 2 of the sliding body 2.
e is inserted through the lower plate 1e, and is covered by the shield plate 3C supported at both ends of the case 1, and the lower plate 1e. The long groove 1h is closed by the insulating substrate 4, so that the entire variable resistor is completely sealed by the insulating molded case 1, the insulating cap 3 and the insulating substrate 4 joined to the molded case 1. Moreover, since each part is attached using a simple fitting means that does not use any parts such as eyelets or nuts, the workability is extremely high.

Note that FIG. 7 shows another embodiment of the fitting structure between the insulating substrate 4 and the pair of protrusions 3e of the insulating cap 3. Instead of providing a shaped notch, a tapered protrusion is used to enlarge the engaging portion 4a between the pair of protrusions 3e of the cap 3, and its purpose and effect are similar to that of the notch. It is exactly the same as the one with .

As mentioned above, the present invention provides a protrusion 1n on the inner wall of the side plate 1b of the insulating case 1 with an opening 1f at one end,
A slider 7 is provided between the top plate 1a of the case 1 and the protrusion 1n.
The sliding body 2 equipped with the case 1 is slidably housed, and the case 1
Since the insulating substrate 4 provided with the resistor 5 is attached between the lower surface plate 1e and the protrusion 1n, in assembling it, the upper surface plate 1a and the protrusion 1n are first removed from the opening 1f of the case 1. 1n, and then insert the board 4 between the bottom plate 1e of the case 1 and the protrusion 1n. body 6 and
This allows the sliding body 2 to come into contact with the slider 7, and brings about remarkable practical effects such as extremely simple assembly.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main parts of a conventional sliding variable resistor, Figs. 2 to 6 show an embodiment of the sliding variable resistor of the present invention, and Fig. 2 is a perspective view of each part thereof. Figure A shows the partially broken case 1, the opening is the sliding body 2, Figure C shows the insulating cap 3, Figure 2 shows the insulating board 4, and Figure 3 shows the case 1 and the insulating part. FIG. 4 is an explanatory view of the main parts explaining the attachment of the cap 3, FIG. 4 is an explanatory view of the main parts explaining the coupling between the insulating substrate 4 and the cap 3, FIG. 5 is a longitudinal cross-sectional view thereof, and FIG. 6 is a cross-sectional view thereof. , FIG. 7 is a main part explanatory diagram illustrating another coupling structure between the insulating substrate 4 and the cap 3. 1...Insulating case, 1a...Top plate, 1b...Side plate, 1e...Bottom plate, 1f...Opening Part, 1n...Tsudai, 2
...Sliding body, 4...Insulating substrate, 5...
...Resistor, 7...Slider.

Claims (1)

[Scope of utility model registration request] The other end of the insulating case is integrally formed with a base provided at one end of the upper and lower panels and both side panels, and the opening is at the other end.
Protrusions are integrally provided on the inner walls of both side plates, and an insulating substrate provided with a sliding body equipped with a slider and a resistor is inserted into the case from the opening, and the upper plate and the protrusions are connected to each other. A sliding variable resistor, characterized in that the sliding body is slidably housed between them, and the insulating substrate is attached between the bottom plate and the protrusion.